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x in (-oo:+oo)
(7/8)*x = -5*b // + -5*b
(7/8)*x-(-5*b) = 0
5*b+(7/8)*x = 0
5*b+7/8*x = 0 // - 5*b
7/8*x = -(5*b) // : 7/8
x = (-(5*b))/7/8
x = -40/7*b
x = -40/7*b
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